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Antioxidant and Chemoprotective Properties of Momordica Charantia L. (Bitter Melon) Fruit Extract

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Antioxidant and Chemoprotective Properties of Momordica Charantia L. (Bitter Melon) Fruit Extract African Journal of Biotechnology Vol. 6 (3), pp. 273-277, 5 Febraury, 2007 Available online at http://www.academicjournals.org/AJB ISSN 1684–5315 © 2007 Academic Journals Full Length Research Paper Antioxidant and chemoprotective properties of Momordica charantia L. (bitter melon) fruit extract Asli SEMIZ* and Alaattin SEN Department of Biology, Pamukkale University, 20070 Kinikli-Denizli, TURKEY. Accepted 5 January, 2007 Momordica charantia, commonly known as bitter melon, is used as a vegetable in number of countries. Extracts of M. charantia plant, fruit pulp, and seed have been reported to have a wide medicinal use in the traditional medical systems, most often as hypoglycemic and anti-diabetic agents. We have studied the effect of M. charantia, collected from Kazdaglari (Mount Ida) in Balikesir, fruit extract on glutathione S-transferases (GSTs), cytochrome P450s (CYPs), and antioxidant enzymes in rats. Male Wistar rats, aged 12 weeks and weighing 200-250 g, were given 200 mg M. charantia fruit extract per kg body weight, i.p., for four consecutive days. At the end of the experimental period, the animals were sacrificed, and liver, kidney, and lung were isolated. Our results have indicated significant increase in especially hepatic antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) activities. The strongest increase (about 9-fold) was observed in GPx activities while about 2 to 5-fold increases were observed in SOD and CAT. M. charantia fruit extract also exhibited hepatoprotective effects in CCl4-intoxicated rats. In addition, about 50% increase was also noted with hepatic cytosolic GSTs. On the other hand, treatments of rats with M. charantia significantly reduced both ethoxyresorufin O-deethylase (EROD) and methoxyresorufin O-deethylase (MROD) activities in rat liver microsomes, which are known to be catalyzed by CYP1A isoforms These results suggest that the M. charantia fruit extract possesses the anti-oxidant effects besides having protective activities in rats. Key words: Momordica charantia, antioxidant enzymes, glutathione S-transferases, cytochrome P450, chemoprotection. INTRODUCTION It is generally accepted that reactive oxygen species noids, lycopenes and flavonoids that prevent free radical (ROS) and/or free radicals play an important role in the damages (Stahelin et al., 1991; Steinberg, 1991; Willett, development of tissue damage and pathological events in 1994). Thus, much attention has been focused on the living organisms (Kehrer, 1993; Halliwel and Gutteridge, investigation of antioxidants that can scavenge ROS, 1999). There are increasing evidences that increased especially natural antioxidants, phenolic and flavonoids consumption of fruits and vegetables and intake of from plants which are mostly used as protective agents certain nonnutrients that are present in foods reduce the against free radical-mediated diseases (Shahidi and risk of various pathological events such as cancer Wanasundra, 1992; Rice-Evans et al., 1996). In addition, (Goodwin and Brodwick, 1995; Steinmetz and Potter, the traditional use of medicinal plants or their crude 1996) and cardio- and cerebro-vascular diseases (Rimm extracts in the prevention and/or treatment of several et al., 1996). This is often attributed to the antioxidants in chronic diseases has been increasingly practiced in the fruits and vegetables such as vitamin C, E, carote various different ethnic societies worldwide. This study was designed to specifically investigate the antioxidant and chemoprotective efficacy of Momordica charantia fruit extract by investigating antioxidant *Corresponding author. E-mail: [email protected] Tel: enzymes, cytochrome P450s (CYPs) and glutathione S- +90-258-213-4030/1456. Fax: +90-258-212-5546 transferases (GSTs) in Wistar rat liver, lung and kidney 274 Afr. J. Biotechnol. tissues when it is administered in vivo. near the Edremit Bay between Ayvalik and Edremit. The antioxidant enzymes (AOE) include superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase Extraction (GPx) and indirectly glutathione reductase (GR). Their role as protective enzymes are well known and have The collected fruits, air-dried and fine powdered, were extracted been extensively investigated both in vivo and in vitro in with hexane using soxhlet extraction apparatus according to the model systems. Cytochrome P450 (CYP, EC 1.14.14.1) Soxhlet’s method where materials are extracted by repeated enzymes are active in monooxygenation and percolation which lasts about 6 - 8 h with hexane under reflux in a special glassware. At the end of extraction process, the solvent is hydroxylation of various xenobiotics, including drugs, then evaporated and the remaining mass is measured. The carcinogens, environmental pollutants as well as many percentage yields are calculated as mg per g dried fruits. Finally, endogenous substrates, fatty acids, arachidonic acids, residues were dissolved in dimethysulfoxide (DMSO) : water (8:2) steroids, prostaglandins, leukotrienes (Nebert and mixture. Gonzales, 1987; Zimniak and Waxman, 1993). Glutathione S-transferases (GST, EC 2.5.1.18) are a Animal complex multigene family of enzymes that are widely distributed in the animal kingdom (Snyder and Maddison, Male Wistar rats (12-14 weeks old) weighing 200-250 g were used. 1997). The most important function of GST is They were housed University Animal House in standard conditions detoxification, conjugating reduced glutathione with a and fed with standard diet with water ad libitum. All experimental large number of electrophilic metabolites derived from a procedures in animals such as administration of substances by i.p., variety of xenobiotics, including carcinogens, toxins and collection of blood and tissue etc. are performed to the national standards under appropriate regimes with Veterinary services and drugs. GSTs are also involved in the metabolism of licensed projects. Rats were randomly assorted into the following endogenous substances such as leukotriene and four groups (each group consisting of 8-20 rats). Group I (control) prostaglandins. some rats were treated with DMSO-water mixture, i.p. daily for 4 Momordica charantia L. (Cucurbitaceae) known as days; Group II (Mom) rats were treated with M. charantia fruit bitter melon, balsam pear, Karela, etc. is a vegetable extract 200 mg/kg, i.p. daily for 4 consecutive days; Group III (CCl4) rats were administered with CCl to induce hepatotoxicity at dose of indigenous to tropical areas including India, Asia, South 4 10 mg CCl4/kg, i.p. daily for 2 consecutive days; and Group IV America and Africa and cultivated throughout South (Mom + CCl4) rats were pretreated with 200 mg/kg; i.p. daily for 4 America as food and medicine. Various preparations of consecutive days prior to administration of CCl4 10 mg CCl4/kg, i.p. M. charantia from injectable extracts to fruit juice to dried daily for 2 consecutive days. fruit bits have been traditionally used worldwide, At the end of experimental period, the rats were anesthetized particularly for blood-sugar lowering effects (Welihinda et with ether following a 16-hr fasting. Blood samples were taken from aorta to determine the serum enzymes. The livers, lungs and al., 1986; Raman and Lau, 1996). In addition, it has been kidneys were removed and rinsed with cold physiological saline and reported to exhibit diverse biological activities such as stored at -80°C until analyzed. antioxidant, antimicrobial, antiviral, antihepatotoxic and antiulcerogenic activities which are attributed to an array of biologically active plant chemicals including Chemicals triterpenes, pisteins and steroids (Grover and Yadav, 1-chloro-2,4-dinitrobenzene (CDNB), alanine, aspartic acid, bovine 2004). serum albumin (BSA), glutathione reduced (GSH), H2O2, Although M. charantia is not a native plant in Turkey, glutathione reductase, methoxy- and ethoxyresorufin, cholic acid, - the fruits, known as “kudret nari”, are frequently used in nicotinamide adenine dinucleotide phosphate (-NADPH) and folk medicine, especially in west and southwest part of pyrogallol were purchased from Sigma (USA). All other chemicals Anatolia for the treatment of peptic ulcers and tumors. and solvents were of highest purity and analytical grade. Recently, the plant is being cultivated in Western Anatolia. In the view of ethnomedical reports M. charantia Preparation of tissues subcellular fractions is being used in folkloric medicine on various ulcers, diabetes and infections (Gurbuz et al., 2000; Scartezzini The tissues were homogenized in 5 parts homogenization solution and Speroni, 2000; Beloin et al., 2005). Thus, present (1.15% KCl containing 250 mM EDTA, 100 mM phenylmethylsulphonylfluoride, 100 mM butylated hydroxytoluene, study was undertaken to further characterize the 0.025% cholate) using a tissue homogenizer with a teflon pestle at biological activities of M. charantia. 4°C. The subcellular fractions of rat tissues were prepared by a standard differential centrifugation procedure as described previously (Sen and Kirikbakan, 2004). The amounts of proteins in MATERIALS AND METHODS various fractions were measured using the method of Lowry et al. (1951) with BSA as the standard. Plant material Determination of total antioxidant response The fruits of M. charantia were collected in the fall of 2003 and 2004 from the foot of Kazdaglari (Mount Ida), Balikesir, Turkey. Antioxidant capacity of M. charantia was determined by measuring Mount Ida, which is also very popular in mythology
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